A bank or trust company that is acting as a fiduciary or agent may, in its discretion or at the direction of another person who is authorized to direct the investment of money held by the bank or trust company, invest in the securities of an open-end or closed-end management investment company or investment trust that is registered under the federal Investment Company Act of 1940, as amended. The bank or trust company, or any affiliate thereof, may provide services to the investment trust or investment company, including acting as an investment advisor, manager, sponsor, distributor, custodian, transfer agent or registrar, and may receive reasonable compensation for the services; provided that with respect to any funds invested, the bank or trust company or its affiliate shall disclose to the persons to whom statements of the account are rendered the rate, formula or other method by which the compensation paid is determined.